what is j loop

this part?

printf("Genereeritud matrix on:\n\n");

for(i=0; i<RIDU; i++)
{
for(j=0; j<VEERGE; j++)
{
printf("%4d", maatriks[i][j]);
}
printf("\n\n");
}


i dont get the "loop" word.
Also since it is late here (17:33pm), my teacher told me to go home and finish it there and send it to him by midnight.... i gtg for like 30mins or so to get home and keep doing it there.